Machine fob



F. N. DU BOIS.

MACHINE FOR ORUSHING QUARTZ.

No. 28,849. Patented June 26, 1860.-

UNITED STATES PATENT OFFICE.

F. N. DU BOIS, OF CHICAGO,

ILLINOIS.

MACHINE FOR ORU'SI-IING QUARTZ.

Specification of Letters Patent No. 28,849, dated June 26, 1860.

To all whom it may concern:

Be it known that I, F. N. DU 1301s, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Crushing Quartz; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1, represents a side view; Fig. 2, a vertical longitudinal section, and Fig. 3, a plan of the machine.

Similar letters of reference in each of the several figures indicate corresponding parts.

The first part of my invention consists in so constructing and arranging the stationary back of the hopper and the vibrating front of the hopper, that the escape passage shall extend on a curved line in rear or to one side of a line drawn vertically through the apex of the angle formed by their inclined surfaces. Thus having the opening of the hopper change its direction at the lower part of the jaws, the quartz, when it falls into the hopper, as the jaws begin to open, cannot fall through, but has to stop till the jaws close up and break it fine enough to pass out on a curved line through the passage 8, under the lower end of the stationary jaw. This arrangement insures a perfect or more uniform crushing of the quartz than the arrangement in the Blake machines patented in 1858 and 1860, for in the Blake machines, the passage is straight through and fiat pieces can pass out, whereas in my machine, owing to t e escape being curved, such fiat pieces cannot readily go out without being crushed, as they meet with difficulty in turning the corner. This feature of my invention is a very essential one in my machine, as it prevents large pieces getting between and choking the rollers.

It consists, second, in an adjustable stirrup, in combination with eccentrics and the arms of two or more vibrating jaws for the purpose of limiting the extent of motion of these jaws.

To enable others skilled in the art, to make and use my invention, I will proceed to describe its construction and operation.

Two rollers a, Z), are arranged upon two parallel shafts, one the driving shaft j, the other a secondary shaft 70. The rollers are placed near enough together to complete the crushing of the quartz or other similar ma terial which has been previously broken by crushing jaws hereafter to be described. The two rollers are geared together by two cog wheels cl, 0, upon their shafts, the two gear wheels being of unequal diameter, so as to cause one roller to revolve at a greater speed than the other. Thus the material introduced between the two rollers, will not only be exposed to a simple pressure while passing through between the rollers, but at the same time, it will be subjected to a grinding or drawing operation, as it has to pass between two surfaces, one of which moves faster than the other. By this means, the material will be drawn apart or reduced in a very effective manner. One or each of the rollers may be supplied with a scraper t, to keep the surface clean.

The material to be crushed is introduced into a hopper 2, from which it passes onto the inclined crushing jaws p, p, g.

The jaw 51, is arranged in grooved ways 1", in the frame of the machine for the purpose of being adjusted higher or lower so as to increase or decrease the size of the orifice s, between the lower ends of the crushing surfaces of the jaws. The adjustment of this orifice will of course determine the size of material let through to be operated upon by the grinding rollers a, Z).

Two or more vibratory crushing jaws p, p, are pivoted ato, at some distance from a vertical line :20, w, passing through the apex as, of the angle formed by the crushing surfaces of the jaws g, and p, p, as repre sented in Fig. 2. On account of this arrangement of the center of motion of the jaws p, 10, these jaws (when vibrating on their pivot 0, toward the jaw 9,) will not only compress the material between the roughened surfaces of p, p, and 9, but subject it also to a bearing motion, thus making the crushing process more effective.

It will be observed that the orifice s, is of curved form and is situated in rear of the vertical line 00, m, drawn through the apex of the angle formed by the two crushing surfaces of the hopper. Thus having this orifice extend under the stationary jaw q, compels the substances which are fed into the hopper to take a turn before they can escape, and therefore fiat pieces which would pass out if the escape was on the vertical line or straight through, are more likely to be retained until the jaws of the hopper come together and crush them.

Motion is transmitted to the vibratory jaws, by means of arms g, h, attached to the jaws and resting against eccentrics e, f. These eccentrics are keyed to a shaft 2', which is geared with the driving shaft j, by means of cog wheels Z, m. As the shaft and the eccentrics revolve, the arms g, h, resting against the eccentrics, will alternately rise and fall so as to impart to the jaws p, a vibratory motion around their pivot 0.

I have found it more advantageous to employ two or more vibratory jaws 10, although one may be used to a good purpose. When two are used, I arrange the eccentrics e, 7, so that one jaw 29, approaches the jaw while the other one recedes from it. By uslng two jaws, the expense of power is equalized, whereas if only one vibratory jaw is employed, all the resistance in the machine would be experienced during one half of the revolution of the eccentric, while the jaw 79, is made to approach the jaw g, so as to crush the material between the jaws, and during the other half of the revolution of the eccentric, while the jaw p, recedes from the jaw, there would be no resistance at all.

A stirrup w, is hinged at u, so that it may be raised or lowered by operating the stirrup arm w, and inserting it between any two of the pins y, projecting from the frame of the machine. It will be seen that on raising the stirrup, the arms 9, It, will come to rest against it, and by raising it still higher, the action of the eccentrics upon the arms 9, it, will be limited, as the arms g, It, will only descend until theyrest upon the stirrup. By this means, the crushing process between the jaws p, p, 9, can be regulated at will.

I do not claim the use of rollers alone for crushing quartz, nor do I claim the use of stationary and vibrating jaws alone, but

What I do claim as my invention and desire to secure by Letters Patent, is-

1. S0 constructing and arranging the sta tionary back of the hopper and the vibrating front of the hopper, that the escape passage 8, shall extend on a curved line in rear or to one side of a line drawn vertically through the apex of the angle formed by the two inclined sides of the hopper, substantially as and for the purposes set forth.

2. An adjustable stirrup w, in combination with eccentrics e, f, and the arms 9, h, of two or more vibratory jaws 7, 39, for the purpose of limiting the extent of the motion of these jaws, substantially as set forth.

The above specification of my improvement in machines for crushing quartz signed by me this 24th day of April, 1860.

F. N. DU BOIS.

Witnesses:

GOODWIN Y. AT LEE, R. W. FENWIOK. 

